Hy,
If you create a title like : Jonathan's wife
It appears correctly in your gallery in the caption with all your previews. But when you click on the picture, and it goes full screen with only the title showed in the left bottom corner, then the title is truncated and contains only the first part (here it shows only Jonathan). The 2nd part starting with « ' » character and continuing with « s wife » is not shown on the screen.
I guess it's some kind of regexp or html oblivion somewhere
Good luck !